Lock nut



' June 5, 1923.

W C. PETERS LOCK NUT Filed Feb. 1, 1922 zsneezs-sheevl ATTY.

June 5, 1923.

w. c. PE'rRs LOCK NUT Filed Feb. 1, 1922 2 Sheets-Sheet 2 Patented June 5, 1923. l p e WALTER CLAYVPETERS, on ennnrnnmrnrwon'rn, ENGLANDI LOCK nun Application filed February 1, 1922. Seria1.No. 533,216.

To all whom it, may concernf I Be it known that I, WALTER CLAY PETERS, invention, the'arrangement of the two screw" 50 1 subject of theKing of Great Britain, residthreaded longitudinally interconnected pori: J ing at The Brook, Graffham, Petworth, in tions of the twin nut is such that whilstthey 5 the county of Sussex, England, have inventhave absolute freedom to turn relatively to ed new and useful Improvements in Look each other in the direction to approach one Nuts, of which the followingis a specifianother along the thread of the bolt, relative 55 cation. I turning in the reverse direction is precluded This invention relates to lock nuts of the beyond the unlocking position, whereinlthe;

kind in which the nut is formed in two screw threads vof the two portions are situated threaded portions longitudinally interconalong the same helical line. I r i nected by a conically divergent spi ot on the p In other words, in screwing up thenut on 60 one part being located ina conically under-: arrest of the inner'of the two portions of the i out socket in the other part, thus constitutnut ag'ainst the work, the outer portion can 7 15. ing a normally inseparably interconnected be continued to be turned until the locking twin nut, the two portions of which are relais effected, but onunscrewing the nut, when" tively rotatable. the outer portion has beenturnedsufliciently 65 -Nuts of this type are described and illustrated in the specification of United States Patent No. 996133. a a

Locking of such an inter-dovetailed lock nut is effected by turning the two portions relatively to. each other so that they tend to approach one another inscrewing along the thread of the bolt, like an ordinary nut locked by a second nut. w

However, also on turning the twoportions of the twin nut relatively to each other so that they tend to separate screwin in opposite directions along the thread 0? the bolt, the twin nut becomes jammed on the bolt. I Externally the twin nuts generally look like two ordinary superposed nuts, hence an operator, unaware thathe is dealing with an interconnected twin nut, in attempting to remove such a twin nut from a bolt, is liable to continue turning the outer portion of the nut beyond the unlocked position into the alternative jamming position damaging the 40 fine adjoining ends of the two portions of the nut. By exerting excessive force the two portions of the nut may even be torn asunder. v

The object of the present invention is to of a twin locknut of the above-described type, by over-running the unlocked position ,on being unscrewed.

provide means for preventing the jamming 1 F or this purpose, according to the present I I to unlock the nut it cannot be turned any further in the unscrewingdirection without being accompanied by the inner portion, orv portion nearer the work. i

This is efl'ected by the encounter of abuts";

ments between the two portions of the nut; when the screwv threads of each are in 'alignment. v The above, describedffunction 'of the" in! Vention lnvolves a further advantage, which is that as the turning to unlock cannotbe 1 pursued beyond the unlocking position-,' bfoth unlocking and unscrewing. can be effected by a single spanner applied solely to the outer portion of the nut, the .innerportion being picked up'and participates in the rotation when the abutments meet. 7

The mutual abutment's may be a ball in I hemispherical recess in the meeting face of one portion of the nut protruding into a segmental circular groove in the meeting face of the other portion of the nut, one end of the groove being encountered by the ball when the two portions are turned relatively to each other from the locked to the unlocked position, and the other end of the groove. being so remotethat amplerelative angular movement to eflect locking is permitted.

L Alternatively to the ball, a pin or stud may be employed. The pin may slide in the one nut and over'the meeting face of the 2. In a twin lock nut, a nut having an un-" undercut socket, a second nut, a conically dercut socket, a second nut, a conically didivergent spigot on said second nut fitting V vergent spigot on said second nut fitting said socket, and a ball located at and ensaid socket, and a ball located in the meeting tered in a segmental groove in the meeting 5 face of said second nut and entered in a se (face of each said nut. mental groove in the meeting face of sald In testimony whereof I have signed my socketed nut. 1 name to this s ecification.

3. In a twin lock nut, va. nut having an W LTER CLAY PETERS. 

